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Quick Answer. It takes 9 to 10 hours to cook a 3-pound beef top round roast in a Crock-Pot at the low setting. The roast only requires about 5 hours of cooking time at the high setting, but this tough cut of meat isn't recommended for cooking on the high setting. The faster cook time and higher temperature doesn't break down the tough meat fibers and leaves the roast tough.
The method of cooking a roast in a roaster is called braising. A three pound roast would cook aproximately 2 to 2 1/2 hours at 325. The inside temperature should be 140 degree â¦ s for rare, 160 degrees for medium, and 170 degrees for well-done. Use meat theomometer for this.uice makes excellent gravy Good luck!   If it's frozen then 15 minutes per pound. However, in this case it may take 1/2 hour to 45 minutes. Put oven up to 400 for 15 minutes to sear roast, then turn down to 350. If in doubt use a knife and put a small cut in the thickest part of the roast.